code: def _unsafe_shift(a, skew, t_scale):
      # At a=1 the lhs has a root and the rhs has an asymptote.
      return (skew.sign() * t_scale - skew) * (math.pi / 2 * a).tan()
  
file_path: pyro/pyro/infer/reparam/stable.py
imports: import math
  import torch
  import pyro
  import pyro.distributions
  from pyro.distributions.stable import _standard_stable, _unsafe_standard_stable
  from pyro.infer.util import is_validation_enabled
  from .reparam import Reparam
label_desc: Use image node_id 1 for calling a global function with example usage: _unsafe_shift(a, skew, t_scale) and returns: unknown